# Tagged Questions

**2**

votes

**0**answers

48 views

### Smallest distribution of points with genuinely different clusterings

An hierarchical clustering algorithm for (finite) sets of points in a given metric space is essentially determined by its linkage criterion, which defines the distance between arbitrary (finite) sets ...

**3**

votes

**1**answer

147 views

### How to perform Importance Sampling with Prior Information

Let us define a random variable $X$ with density function $p(x)$. We wish to calculate $\mathbb{E}[f(X)] = \int f(x)p(x)dx$. We can compute the expectation by Monte Carlo simulations as
...

**0**

votes

**0**answers

41 views

### Statistics applied in A/B Testing and calculating ideal test duration for statistical significance

I'm trying to get my head around the maths used here:
http://visualwebsiteoptimizer.com/ab-split-test-duration/
Can someone point me in the right direction in terms of what algorithms/mathematics ...

**0**

votes

**1**answer

98 views

### What is the Bahadur-Anderson Algorithm?

What is the Bahadur-Anderson Algorithm, and which book could one read to learn it?

**0**

votes

**2**answers

240 views

### Creating composite rank [closed]

Problem: Suppose that $K$ different students are ranked based on $N$ different parameters (such as Physics marks, English marks, Biology marks, IQ etc). The rank under each parameter can be repetitive ...

**0**

votes

**2**answers

329 views

### Is there a method to find (fit) a function with four (4) independent variables?

I have a system with 4 sensors (say $s_1..s_4$) which I want to combine into a single signal.
I have logged the 4 outputs as well as a "control" sensor ($s_c$) which has the desired ouput signal. ...

**6**

votes

**2**answers

342 views

### finding the $n$ closest pairs between $2n$ points

Given $2n$ points $x_1, x_2 \ldots x_{2n}$ and a distance $d_{i,j}$ defined between them, how can I best find the set $P$ of mutually exclusive pairs $(i,j)$ such that the sum of their distances
$$
...

**1**

vote

**3**answers

722 views

### Concrete examples concerning standard deviations and mean absolute deviations

Once again stackexchange is not responding to one of my questions (so far no comments, no answers, two up-votes). Hence this "crossposting":
Is there a simple (or not simple?) algorithm that will ...

**3**

votes

**2**answers

2k views

### Numerically most robust way to compute sum of products (standard deviation) in floating-point?

I stumbled across a paper by Welford (1962), where he proclaims a method that should compute the standard deviation numerically more robust than the naive algorithms ...

**4**

votes

**3**answers

347 views

### Probability estimates for “beans & boxes”

From a discussion with some friends, this apparently easy problem has come out; I decided to post it here, because I believe that the answer is non-trivial and the maths beneath interesting. Partial ...

**3**

votes

**4**answers

731 views

### Question about this ratio in Metropolis-Hastings MCMC algorithm

I have a stupid question about the Metropolis-Hastings sampling algorithm.
If I got this right, for every variable $X$ in turn, which currently has value $x_{old}$, you generate a new sample ...

**1**

vote

**2**answers

156 views

### Finding a representative of a branch in hierarchical clustering

I have constructed a hierarchical clustering of data using some proximity function. Now I would like to calculate a representative value of any given node of this clustering, such that it reflects the ...